Elenco Electronics EP-50 - Experiment #33: Electronic Noisemaker

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Connect the wires according to the Wiring Checklist,
connecting the battery wire last since it will turn the circuit
on. Press the switch several times quickly. Then turn the
variable resistor knob to change the frequency of the
sounds.
Do you understand what’s happening when you press the
switch? You increase the oscillator capacitance by
putting the .0047mF in parallel with the .047mF, and this
lowers the oscillator frequency.
As usual you can experiment with changing component
values if you like.
EXPERIMENT #33: Electronic Noisemaker
Wiring Checklist:
o 19-to-25
o 5-to-21
o 6-to-22
o 30-to-56
o 55-to-23-to-32
o 49-to-47
o 46-to-33-to-31-to-38
o 18-to-39
o 20-to-26
o 27-to-50-to-24
Schematic